MTW.js

/**
 * Copyright 2016 Signal K <info@signalk.org> and contributors.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

'use strict'

 const utils = require('@signalk/nmea0183-utilities')

 /*
  * MTW - Mean Temperature of Water
  *
  *        0   1 2
  *        |   | |
  * $--MTW,x.x,C*hh<CR><LF>
  *
  * Field Number:
  *   0.    Degrees
  *   1.    Unit of Measurement, Celcius
  *   2.    Checksum
  *
  */

module.exports = function (input) {
  const { id, sentence, parts, tags } = input

  const delta = {
    updates: [
      {
        source: tags.source,
        timestamp: tags.timestamp,
        values: [
          {
            path: 'environment.water.temperature',
            value: utils.transform(utils.float(parts[0]), 'c', 'k')
            //returns raw value, no transformation done
          }
        ]
      }
    ],
  }

  return delta
}